Firefly III

The application provides a self‑hosted personal finance manager that records income and expenses using double‑entry bookkeeping. It lets users organize transactions with budgets, categories and tags, and supports multiple currencies. Data can be imported from various sources through a dedicated importer, and an advanced rule engine can transform or clean up imported CSV files automatically.

Users such as individuals or small teams who want to keep their financial data under their own control can benefit from the system. It offers recurring transaction handling, detailed financial reports that break down spending by week, month or year, and a REST‑JSON API that enables external tools or mobile apps to interact with the core features.

The software is released under the AGPL‑3.0 license, is free to use, and does not require a subscription. It is stable, open source, and designed to run on the user’s own server, ensuring that no external contact occurs unless explicitly configured.